What your doing does sound like a really good idea all id say is how are you venting it during this experiment. If you could I'd open the doors fully and make a temp screen mesh to stop the rats escaping. I think from your videos you have a screen mesh on top as well?. Mines all timber with glass front so the moisture had nowhere to escape to.
How well established are you clean up crew now? Even if you flooded the Viv with them I don't think they'll be able to cope with that amount. Also male rats do leave a urine trail nearly everywhere they go. With such a small set up compared to what they would have in the wild there scent might scare your baby.
I think to start with, when you put your snake back in he/she might be able to smell the rats from before and act strange but after a week or so it should go.
That picture is. Kinda the latest since my flooding problem. The only difference is I have 3 edsmall red. Plants in there now. She has another hide under that one that's made from a small bit of bogwood some cork bark and what she's made.
You need to upload some pictures of your set up from your videos it's looking amazing.